[PeterisP]

A license and its drafters can't decide or change what is considered derived work - that's a core concept of copyright law where any nuances could be dependent on the jurisdiction but not on any particular licence.

What LGPL can do is to reassure people by providing specific permission to use the code in some resulting work, no matter if it turns out that it actually is derived work (in which case the licence would grant you the rights you need) or not, in which case you don't need the permission, but it doesn't hurt to have it.